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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2326bb5e8446f4c77a330e59ed3b7a50b6603ca2336359ea792d2c2101884a' 
  AND token = 'OFiaJEiE3G9DdeveWn3cd4FUG/6lBydYbZD/qgjaXFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}